Adjacent Angles

Student Summary

If two angle measures add up to 90∘90^\circ, then we say the angles are complementary. Here are three examples of pairs of complementary angles.

Three images. First, adjacent angles, 30 degrees, 60 degrees. Second, non-adjacent angels formed by two lines, 45 degrees. Third, a triangle, angles 90 degrees, 38 degrees, 52 degrees.

If two angle measures add up to 180∘180^\circ, then we say the angles are supplementary. Here are three examples of pairs of supplementary angles.

Three images. First, adjacent angles, 55 degrees, 125 degrees. Second, perpendicular lines, non-adjacent angles marked. Third, distinct angles, 152 degrees, 28 degrees.

Visual / Anchor Chart

Standards

Building On
4.MD.C

4.MD.C

Addressing
7.G.B

7.G.B

7.G.5

7.G.B.5

7.G.5

7.G.B.5